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  • insertion of isonitriles  (1)
  • insertion reaction with tert-butyl isocyanide  (1)
  • 1
    ISSN: 0009-2940
    Keywords: Al-Al bond ; insertion of isonitriles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of Isothiocyanates and Isonitriles with R2Al-AlR2 [R = CH(SiMe3)2]; Single and Double Insertion of Isonitrile into the Al-Al BondTetrakis[bis(trimethylsilyl)methyl]dialuminium(4) 1 reacts with phenyl or tert-butyl isothiocyanate with cleavage of the C = S double bond. Two compounds are formed: R2Al-S-AlR2 [R = CH(SiMe3)2] 3 and R2Al-C(NR')-AlR2 (4 R' = C6H5; 5 R'= CMe3) with a sulfur atom or an isonitrile group inserted between the aluminium atoms. Compounds 4 and 5 were isolated in high yield by the reaction of 1 with the appropriate isonitriles. By using an excess of phenyl isonitrile a dark red compound 6 is obtained with two isonitrile units inserted into the Al-Al bond and formation of a C-C single bond. According to crystal structure determinations of 4 and 6 a three-membered heterocycle is formed by the interaction of the nitrogen lone-pair to one of the Al atoms in 4, while in 6 both Al atoms are four-coordinated by bonding to a nitrogen and a carbon atom with formation of two across the C-C bond anellated four-membered heterocycles. As shown by NMR spectroscopy the molecular structure of 4 with one stereochemically saturated and one unsaturated Al atom is unchanged in solution even upon heating to 100°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 823-828 
    ISSN: 0044-2313
    Keywords: Al—Al bond ; insertion reaction with tert-butyl isocyanide ; trimeric cyano dialkyl alane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of the Trimeric [(Me3Si)2CH]2Al—CNTetrakis[bis(trimethylsilyl)methyl]dialane(4) 1 with an Al—Al bond reacts with tert-butyl isocyanide in the molar ratio of 1:2 within three days to give a mixture of several unknown products, from which the title compound 4 is isolated in a 26% yield by recrystallization from n-pentane. 4 is a trimer in the solid state via Al—C≡N—Al bridges showing a nine-membered Al3C3N3 heterocycle in a boat conformation. In contrary to the reaction with phenyl isocyanide the expected dark red product of the twofold insertion into the Al—Al bond under formation of a carbon-carbon single bond is detected only spectroscopically as a minor by-product.
    Notes: Tetrakis[bis(trimethylsilyl)methyl]dialan(4) 1 mit Al—Al-Bindung reagiert mit tert-Butylisocyanid im Molverhältnis 1:2 im Laufe von drei Tagen unter Bildung eines unübersichtlichen Produktgemisches, aus dem sich in 26% Ausbeute durch Umkristallisieren aus n-Pentan farblose Kristalle der Titelverbindung 4 isolieren lassen. Wie die Bestimmung der Kristallstruktur ergibt, liegt 4 im Festkörper als Trimeres mit Al—C≡N—Al-Brücken vor, und der sich ausbildende neungliedrige Al3C3N3-Heterozyklus weicht leicht von der Planarität unter Ausbildung einer Wannenkonformation ab. Das mit Phenylisontril hauptsächlich gebildete Produkt der zweifachen Insertion in die Al—Al-Bindung unter Knüpfung einer C—C-Einfachbindung wird hier nur in verunreinigter Form spektroskopisch nachgewiesen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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